ceherzog If it's growing in water, it could be Duck Potato http://www.google.com/search?q=duck+potato&hl=en&prmd=ivnse&tbm=isch&tbo=u&source=univ&sa=X&ei=ThvYTeTtKKnn0QHJyJn8Aw&sqi=2&ved=0CEkQsAQ&biw=1874&bih=893
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